Occultation event with (21601) 98XO89, event index number 819
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/03/17 04:39:02 UTC
J2000 position of star is 11:10:16.6 -20:45:27
Equinox of date position of star is 11:11:31.4 -20:53:41
Star is 37 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
Expected flux drop is 36% with SNR of 9.6 per integration
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 19.6 arcsec/hr.
The recommended exposure time corresponds to 6.7 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 21.6 km.
The sky-plane scale is 3063.7 km/arcsec.
Diameter estimates:
59.7 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
24.4 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 59.7 km used for deployment plan.
Star training set for 21601_98XO89, (2025/03/17 04:39UT) Object RA Dec mag sep mel Spica 13:26:31.5 -11:17:32 1.0 33.74 5 4Gam Crv 12:17:06.4 -17:40:54 2.6 15.80 21 PPM 258681 11:13:49.6 -21:53:12 6.2 1.13 36 PPM 258607 11:10:19.9 -20:39:01 8.1 0.37 37 PPM 258615 11:10:37.2 -21:04:27 9.2 0.28 37 21601_98XO89 11:11:31.4 -20:53:41 14.9 37 Positions are for equinox of date
Star training set for 21601_98XO89, (2025/03/17 04:39UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 33.74 5 4Gam Crv 12:15:48.1 -17:32:30 2.6 15.80 21 PPM 258681 11:12:34.8 -21:44:58 6.2 1.13 36 PPM 258607 11:09:05.2 -20:30:48 8.1 0.37 37 PPM 258615 11:09:22.4 -20:56:14 9.2 0.28 37 21601_98XO89 11:10:16.6 -20:45:27 14.9 37 Positions are for J2000